The Astral Express crew prepares for their jump to the Planet of Festivities, Penacony, when a mysterious voice suddenly echoes in their minds, announcing the activation of a 'Divine Plot Broadcast Livestream.' Simultaneously, across the stars on the continent of Teyvat, travelers like Lumine and Paimon, along with powerful figures such as Zhongli and Nahida, hear the same inexplicable notification. Before anyone can investigate the source, a virtual screen materializes before them, linking characters from both universes into a single, shared chat room.

Confusion reigns as the Trailblazers of the Express meet the adventurers of Teyvat, realizing they are all audience members forced to watch a broadcast of their own destinies. As the countdown begins, secrets threaten to spill, and the boundaries between their worlds start to blur. With no way to exit the stream, they must wait to see what future tragedies and triumphs the system intends to reveal.